Ditto, Mike is excellent. He is ex Motorline BMW and knows his stuff. MFKN3 and I had our superchargers done there. His prices are very reasonable and he does general servicing as well as performance work.

If you are further south Tekno performance at Stapylton are excellent. They are primarily and HSV racing team shop but are highly skilled and have a great shop which is generally not open to the public. They are not keen on ordinary service work but will look after M3 clients
If you are local and a new owner you might want to come along to our track days and events.